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Turns on aggressive optimization. The optimizations at this level are distinguished from -O2 by their aggressiveness, generally seeking highest-quality generated code even if it requires extensive compile time. They may include optimizations that are generally beneficial but may hurt performance.
Enable OpenACC directives.
Target AMD HAWAII GPUs.
Relaxed precision for Target device.
Disable MI scheduler (use alternative scheduler).
Disable register pressure control in the scheduler.
Select C89 standard with GNU extensions.